CN104979866A - Powerline communication for monitoring of a high number of battery cells - Google Patents

Powerline communication for monitoring of a high number of battery cells Download PDF

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Publication number
CN104979866A
CN104979866A CN201510235752.0A CN201510235752A CN104979866A CN 104979866 A CN104979866 A CN 104979866A CN 201510235752 A CN201510235752 A CN 201510235752A CN 104979866 A CN104979866 A CN 104979866A
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CN
China
Prior art keywords
power transmission
line
transmission line
battery
unit
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Pending
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CN201510235752.0A
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Chinese (zh)
Inventor
M·赫尔曼
J·伦斯
S·温克勒
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Publication of CN104979866A publication Critical patent/CN104979866A/en
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

A battery system including a powerline and a plurality of electrically connected smart battery cells each having a cell monitoring unit. The battery system also includes a host controller in communication with the powerline through a plurality of connection lines, where a plurality of the battery cells between adjacent connection lines is referred to as a cell string. The number of cell strings and the number of battery cells in the system determines transfer function gains for signal levels transmitted from the cell monitoring units to the host controller and signal levels transmitted by the host controller to each of the cell monitoring units.

Description

For the thepower line communication of large number of batteries unit monitoring
The cross reference of related application
This application claims the priority that the name submitted on April 3rd, 2014 is called the U.S.Provisional Serial 61/974,820 of " POWERLINECOMMUNICATION FOR MONITORING OF A HIGH NUMBER OF BATTERYCELLS ".
Technical field
The present invention relates generally to a kind of battery system of large number of tandem battery unit being monitored by thepower line communication, and relate more specifically to a kind of battery system of being monitored by the intelligent battery unit separately with communication node of thepower line communication to large quantity, the such as common battery unit more than 20 in power cell of vehicle, wherein, these communication nodes are organized with multiple string mode by high frequency, and wherein power cable forms simple series topology structure.
Background technology
Motor vehicle is just becoming more and more general.These vehicles comprise motor vehicle driven by mixed power, as being combined with the increasing journey motor vehicle (EREV) of battery and main power source (such as internal combustion engine, fuel cell system etc.) and the pure electric vehicle as battery electric vehicle (BEV).These batteries can be dissimilar batteries, as lithium ion formula, ni-mh formula, plumbic acid formula etc.Typically can comprise battery unit that multiple mutual series connection electrically connects to provide vehicle power and energy requirement for the high voltage battery system of motor vehicle.Battery unit can be grouped into battery module, and wherein the unit of module is electrically connected by series connection and/or parallel connection.Element number in module in vehicle and module number depend on battery technology and application.Such as, lithium ion type battery module has electrical series eight to ten six unit in the module usually.Different vehicles can have the different battery design using various compromise and advantage for concrete application.
Due to factors, such as unit self-discharge rate, internal element resistance, electrical connection, cell degradation etc., in battery, As time goes on the charged state (SOC) of unit may offset during battery operation.Battery management system (BMS) can be configured to the cell voltage, impedance, health status, charged state (SOC), temperature etc. of monitoring each battery unit, and control battery based on the SOC of maximum charge unit and minimum charhing unit can by the amount of charging and discharging.
In a known Vehicular battery design, each battery module comprises unit tablet (CSB), and each unit wherein in module is all electrically attached to CSB.CSB receives analog voltage signal from each battery unit module, and adopts filter circuit, multiplexer and analog digital (A/D) transducer etc. that the voltage signal on digital cable communication link is sent to BMS.
A kind of BMS structure of CSB that do not need in each battery module is studied.Especially, what proposed in this area is arrange the thing that one is called as " intelligent cell " often, it comprises the low cost electronics monitoring assembly be integrated in each unit, it comprises the electronic device of voltage for monitoring means and temperature, and to control the charged state etc. of individual unit.More specifically, each battery unit is all equipped with integrated circuit, and it is a part for cellular construction self.Each electronic monitoring assembly in each intelligent cell is the part from each intelligent cell to the communication link of BMS main frame (host), thus makes agreement carry out work with star (leading from (host to slave)) topological structure.
The typical vehicle of the above-mentioned type will generally include the independent battery intelligent unit of the mutual electrical series connection of relatively large amount, independent monitoring assembly wherein in each unit provides signal of communication to independent master controller, and this master controller provides each to independent battery unit of command signal.Due to just relatively large by the quantity of master controller monitoring battery unit, traditional communication technology (as CAN) is usually ineffective for this communication.In order to overcome this restriction a kind of technology well known to those skilled in the art be adopt thepower line communication, wherein, be attached to the object of high voltage transmission line also for communicating of the unit in battery module.Digit order number (digital bit) is modulated on the carrier wave of transmission of electricity above-the-line promotion by controller and multiple unit monitoring assembly, for transfer of data, thus provides signal of communication.
Summary of the invention
Present disclosure describes a kind of battery system, it comprises the intelligent battery unit of power transmission line and multiple electric connection, and described intelligent battery unit has unit monitoring assembly separately.This battery system also comprises the master controller by many connecting lines and thepower line communication, and wherein, the multiple battery units between adjacent connecting lines are called as unit strings (cell string).In the quantity of unit strings and system, the total quantity of battery unit is determined and is passed to the signal level of master controller from unit monitoring assembly and is passed to the transfer function gain of each signal level of unit monitoring assembly by master controller.
By reference to the accompanying drawings, supplementary features of the present invention become clear by from following description and subsidiary claim.
According to the present invention, there is following scheme.
1. a battery system, it comprises:
Power transmission line;
Multiple battery unit, it is electrically connected along described power transmission line, and each battery unit comprises battery unit monitoring assembly, and described battery unit monitoring assembly is monitored the parameter of described battery unit and communication interface is provided to described power transmission line;
Many communication lines, wherein, every bar communication line is all electrically connected with described power transmission line by many connecting lines, wherein, first connecting line is electrically attached to the first end of described power transmission line, and the second connecting line is electrically attached to the second end of described power transmission line, thus make all described battery units all between described first and second connecting lines, and wherein, at least another connecting line is electrically attached to described power transmission line between described first and second connecting lines, thus multiple battery unit is electrically connected along described power transmission line between described first connecting line and another connecting line described, and multiple battery unit is electrically connected along described power transmission line between described second connecting line and another connecting line described, and wherein, article two, the described battery unit between adjacent connecting line is defined by unit strings, and
Controller, it controls the signal be provided on described communication line.
2. the battery system according to scheme 1, wherein, the quantity of connecting line is at least four connecting lines, thus provides at least three unit strings.
3. the battery system according to scheme 2, wherein, described connecting line is being connected to the one of described communication line and is being connected between another communication line alternately.
4. the battery system according to scheme 1, wherein, described many communication lines are two communication lines.
5. the battery system according to scheme 1, wherein, the quantity of described unit strings depends on the quantity of the described battery unit in described battery system.
6. the battery system according to scheme 5, wherein, the quantity of described unit depends on and is passed to the transfer function gain of the transmission of signal of of described battery unit from described controller and is passed to the transfer function gain of the transmission of signal of described controller from one of described battery unit.
7. the battery system according to scheme 6, wherein, the quantity of described unit strings is determined when described transfer function gain is roughly the same.
8. the battery system according to scheme 6, wherein, the transfer function gain of the transfer function gain being passed to the transmission of signal of described controller from described unit and the transmission of signal being passed to described unit from described battery controller is the impedance based on described battery unit.
9. the battery system according to scheme 5, wherein, the quantity of described unit strings depends on the square root of the total quantity of the described battery unit in described battery system.
10. the battery system according to scheme 1, also comprise the X-electric capacity being attached to described power transmission line, it does not need decoupling component.
11. battery systems according to scheme 1, wherein, described battery unit is intelligent cell.
12. battery systems according to scheme 1, wherein, described parameter comprises voltage and the temperature of described battery unit.
13. battery systems according to scheme 1, wherein, described battery system is vehicle battery system.
14. 1 kinds of vehicle battery system, it comprises:
Power transmission line;
Multiple battery pack intelligent cell, it is electrically connected along described power transmission line, and each battery unit comprises battery unit monitoring assembly, and described battery unit monitoring assembly is monitored the parameter of described battery unit and communication interface is provided to described power transmission line; And
First and second communication lines, first connecting line is electrically attached to the first end of described power transmission line and described first communication line, second connecting line is electrically attached to the second end of described power transmission line and described first communication line, 3rd connecting line is electrically attached to described second communication circuit and the described power transmission line between described first and second ends of described power transmission line, 4th connecting line is electrically attached to described first communication line and the described power transmission line between described first and second ends of described power transmission line, 5th connecting line is electrically attached to described second communication circuit and the described power transmission line between described first and second ends of described power transmission line, thus multiple described battery unit is along described first and the 3rd connecting line, described third and fourth connecting line, the described power transmission line of described 4th and the 5th connecting line and the described 5th and second between connecting line and electrically being connected.
15. battery systems according to scheme 14, also comprise the X-electric capacity being attached to described power transmission line, it does not need decoupling component.
16. 1 kinds of vehicle battery system, comprise
Power transmission line;
Multiple battery pack intelligent cell, it is electrically connected along described power transmission line, and each battery unit comprises battery unit monitoring assembly, and described battery unit monitoring assembly is monitored the parameter of described battery unit and communication interface is provided to described power transmission line;
First and second communication lines, it is electrically attached to described power transmission line by many connecting lines, wherein, first connecting line is electrically attached to the first end of described power transmission line, second connecting line is electrically attached to the second end of described power transmission line, thus all described battery units are between described first and second connecting lines, and wherein, other connecting line multiple is electrically attached to described power transmission line, and described first and second communication lines are in an alternating manner between described first and second connecting lines, thus multiple battery unit is electrically connected along the described power transmission line between adjacent connecting line, and wherein, described battery unit between two adjacent connecting lines is defined as unit strings, and
Controller, it controls the signal be provided on described communication line.
17. battery systems according to scheme 16, wherein, the quantity of described unit strings depends on the quantity of the described battery unit in described battery system.
18. battery systems according to scheme 17, wherein, the quantity of described unit depends on and is passed to the transfer function gain of the transmission of signal of of described battery unit from described controller and is passed to the transfer function gain of the transmission of signal of described controller from one of described battery unit.
19. battery systems according to scheme 18, wherein, the quantity of described unit strings is determined when described transfer function gain is roughly the same.
20. battery systems according to scheme 17, wherein, the quantity of described unit strings depends on the square root of the total quantity of the described battery unit in described battery system.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that a kind of employing is attached to the known battery system of the full battery system of power transmission line;
Fig. 2 is the schematic diagram that a kind of employing is attached to the battery system of the half-packaging battery (half-pack) of power transmission line;
Fig. 3 is the schematic diagram that a kind of employing is attached to the battery system of many packet modes battery (multi-pack) of power transmission line;
Fig. 4 is the schematic diagram comprising the multiple battery unit separately with intelligent cell monitoring assembly and comprise the battery system of the many packet modes battery being attached to power transmission line;
Fig. 5 is the high frequency equivalent circuit figure for the battery system shown in Fig. 4;
Fig. 6 is the simple equivalent circuit figure of circuit shown in Fig. 5;
Fig. 7 is for from the equivalent electric circuit to master (slave-to-host) receiving and transmitting signal; And
The master when quantity of Fig. 8 to be trunnion axis be unit strings and vertical axes are signal gain is to from (host-to-slave) with from the chart to main signal gain.
Embodiment
Hereinafter for the embodiment with the battery system of large number of batteries unit adopting thepower line communication only exemplarily property in itself, be intended to absolutely not restriction the present invention or its application or use.Such as, battery system as herein described is for applying at vehicle, but this battery system also will have the application in fixed system.
Fig. 1 a kind ofly known comprise multiple battery module 12 and has the schematic diagram of the battery system 10 of the multiple intelligent battery unit 14 connected by electrical series along power transmission line 16.The electrical configurations of this intelligent cell 14 is intended to represent any suitable configuration of the battery unit of the group comprising serial or parallel connection unit.Unit 14 is intelligent cell, and wherein each unit or little unit group include an independent monitoring assembly 36 to realize the object of unit monitoring and communication, as discussed above.The quantity of the unit 14 in the battery system 10 shown in it should be noted that herein is 16, and it is only for purposes of illustration, and may include 100 or more battery unit for the typical unit bag of vehicle.In addition, it should be noted that this battery unit 14 be intended to represent can adopt the vehicle of intelligent cell technology any suitable battery unit that is suitable for, such as lithium ion formula, ni-mh formula, plumbic acid formula etc.
Battery system 10 comprises master interface controller 18, and it has signal generator 20 to provide signal of communication and from its receiving communication signal, wherein this communication line 22 and 24 is electrically attached to power transmission line 16 on communication line 22 and 24.Especially, the connecting line 26 separately with electric capacity 30 is connected to the node 28 in communication line 22 or 24 and power transmission line 16, and its end node 34 represents positive battery electrodes.Like this, controller 18 can provide signal of communication and from power transmission line 16 receiving communication signal in power transmission line 16.Intelligent cell monitoring assembly 36 in each unit 14 provides the signal of communication being used in particular for identifying that this unit runs that will be received by master controller 18 on power transmission line 16, as cell voltage, cell temperature etc., and signal is provided to intelligent cell 14 with control unit 14 by this controller 18 on power transmission line 16, such as, for resistance unit balance (resistive cell balancing), SOC charging restriction etc.
Owing to having the battery unit 14 of larger amt between the node 28 and 34 shown in system 10, known intelligent cell thepower line communication technology suffers the impact of low signal level usually.In addition, owing to only there is the power transmission line 16 of two tie points to unit bag 12 at node 28 and 34, on power transmission line 16, pin divided by the quantity of unit 14, therefore only will can receive very low signal level from the monitoring assembly unit 14 to the signal of communication level of unit 14.As hereafter discussed, the present invention will propose to arrange multiple (being namely greater than two) tie point from master interface controller 18 to power transmission line 16, thus have the multiple inputs to communication line 22 and 24, thus overcome these restrictions.
In the power transmission line topological structure of prior art, as shown, system 10 comprises and is electrically connected to power transmission line 16 and through the X-electric capacity 32 of battery unit 14.This electric capacity is usually present in (such as drive system, charger, electrical condenser auxiliary power module etc.) in any high pressure (HV) equipment be connected thus makes the signal between line 22 and 24 produce significant decay, thus needs decoupling component 38.
Fig. 2 is similar with battery system 10 and represents the schematic diagram of the battery system 40 of half-packaging element connection, and wherein same reference number refers to identical element.In battery system 40, the additional connections 26 comprising electric capacity 30 is arranged between communication line 22 or 24 and power transmission line 16, and wherein all connecting lines 26 and electric capacity 30 are alternately attached to line 22 and 24.In this type of design, the intelligent cell quantity between the one of two on power transmission line 16 specific nodes 28 or node 28 and node 34 decreases half.Therefore, the communication between intelligent cell 14 and master controller 18 shows better balance, because there are two signals " to inject (injection) " from node 28 and 34 to communication line 22 and 24.
It should be noted that, as used herein, the battery unit section along the power transmission line 16 between two nodes 28 is called as unit strings, and wherein system 40 comprises two unit strings.It should be noted that further, as shown in system 40, between power transmission line 16 and communication line 22 and 24, three connecting lines are set only for purposes of illustration.According to the quantity of unit 14 and required signal level and communication path, other design may use the unit strings of greater number.Discussion below provides a kind of method of the optimal number for carrying out determining unit string for specific battery system.And for real execution mode, although (computational methods discussed for below supposed) that the battery unit 14 in all unit strings with equal number is normally practical, such situation is optional.
Fig. 3 shows the schematic diagram of the battery system 50 of another embodiment of many packet modes battery, and described many packet modes battery connects and comprises four unit strings, and wherein same reference number refers to the element identical with system 40.In system 50, as illustrated, between power transmission line 16 and communication line 22 and 24, be provided with the tie point having more two.
In system 40 and 50, X-electric capacity 32 is attached to communication line 22, is only used to prevent the signal attenuation between online 22 and 24, thus without the need to decoupling component 38.Usually this is all set up for any topological structure with even number unit strings.Therefore, the robustness of this opposing outside X-electric capacity is the benefit of the topological structure of proposed battery cell system.
Fig. 4 is the schematic diagram of the battery system 70 similar with above-mentioned battery system, and wherein same reference number refers to identical element, and wherein system 70 pairs of physical battery systems provide better explanation.In this embodiment, master controller 18 is electrically attached to power transmission line 16 by many connecting lines 26 and electric capacity 30.In addition, be shown as one that is attached to unit 14 from controller 84, and be intended to represent the intelligent cell detection components 36 in that unit 14, its providing unit voltage, temperature detection and cell resistance balances.The each of unit 14 in system 70 all will comprise from controller 84.
Fig. 5 is equivalent electric circuit Figure 90 of battery system 70, and wherein, same reference number refers to identical element.The thepower line communication adopted by typical vehicle battery system will form HF communication circuit, typically be in the scope of 1-100MHz.Due to HF communication, then each battery intelligent unit 14 will look like the impedance Z to the signal of propagation on power transmission line 16 b, it is expressed as impedance component 92.In addition, each electric capacity 30 in connecting line 26 will have connection impedance Z c.But the electrical structure of electric capacity 30 and numerical value are it is assumed that connect impedance Z cmuch smaller than cell impedance Z b, this means that electric capacity 30 can replace with short circuit in the receiver-mode (rx) filter configuration.
For this reason, Fig. 6 is equivalent electric circuit Figure 100 of system 70, wherein each unit strings 102 be all represented as between communication line 22 and 24 of unit strings between particular nodes.The quantity of the string 102 in the quantity (being also represented as K herein) of the impedance component 92 in each string 102 and battery system 70 is left a blank, as become clear by from discussion hereafter in this figure.In addition, in order to discussion hereafter, all cell impedance Z of all unit 14 are supposed bidentical.And it should be noted that, the quantity of the unit 14 of each string 102 is identical, but this is not requirement of the present invention, but desirable in actual execution mode.
As described above, in concrete battery monitoring system, there are two communication directions, that is, be sent to the signal from controller 84 by master interface controller 18, and by being sent to the signal of master interface controller 18 from controller 84.For each of these direction of transfer, be necessary to determine at master interface controller 18 or in the voltage U received from controller 84 2relative to by the voltage U transmitted to master controller 18 from controller 84 1transfer function gain G.It should be noted that, for this discussion, no matter send by master controller 18 or by from controller 84, the voltage of transmission of signal is all U 1, and no matter at master controller 18 or receiving from controller 84, the voltage of Received signal strength is all U 2.
First, for master interface controller 18 with voltage U 1transmission of signal and by with specific from controller with voltage U 2situation about receiving.In this communication direction, master interface controller 18 is positioned at low-down impedance, and receive be positioned at very high impedance from controller 84.Based on hypothesis herein, equation (1)-(3) can be used to transfer function gain G hsbe defined as the relation between these voltages.Based on this analysis, transfer function gain G can be drawn hsbe the inverse of element number in each string, it can be used to determine for needing how many unit strings K in particular design, and wherein, N is the quantity of unit 14 in each string K, and KN represents the sum of unit 14.
U x＝| U x | (1)
U 2 = U 1 N - - - ( 2 )
G hs = 1 N = K NK - - - ( 3 )
As described above, for by a signal of communication to master controller 18 from controller 84, suppose to be positioned at low-down impedance from controller 84, and master controller 18 is positioned at very high impedance.In addition, suppose that the quantity of unit 14 is much larger than 1 in specific string.Fig. 7 is for by the equivalent electric circuit 110 from controller 84 to the transmission of master interface controller 18 signal, and wherein, signal generator 112 produces at the transfer overvoltage U from controller 84 1with the receiver voltage U at controller 18 place 2.Circuit element 118 represents and is transmitting other the combined impedance of string 14 all from same a string 102 of controller 84 place, and impedance component 120 represents other the combined impedance of string all in other strings all, wherein, the impedance that impedance component 118 has is (N-1) Z b, and the impedance that impedance component 120 has is all impedance components 92 in specific string 102 can be reduced to by NZ bthe single impedance component of definition.Based on these hypothesis and equivalent electric circuit 110, by this transfer function gain G from controller 84 to master controller 18 sh1/K is defined as by following equation (4)-(6).
G sh = U 2 U 1 = ( N K - 1 Z b ) ( N - 1 ) Z b + ( N K - 1 ) Z b - - - ( 4 )
G sh = N 1 + K ( N - 1 ) - - - ( 5 )
G sh ≈ 1 K - - - ( 6 )
Fig. 8 be go here and there number K for trunnion axis and with in the display online 122 that is vertical axes of transfer function gain G by master controller 18 to the transmission gain of the signal of from controller 84 and on 124 lines by from one of controller 84 to the relation the transmission gain of the signal of master controller 18.As can be seen, on 124 lines by from one of controller 84 to the signal gain of the transmission of master controller 18 for very good when only having several string, for then relatively poor to the transmission of signal gain of from controller 84 by master controller 18.Along with the quantity of string increases, by a gain reduction to the transmission of signal of master controller 18 from controller 84, but increased by the gain of master controller 18 to the transmission of signal of from controller 84.In the specific non-limiting example of these about 100 battery units, line 122 and 124 crosses at the point 126 of about ten strings.Consider that optimum string number is when two transfer function gains are identical value, the quantity for the string of discrete cell number can be confirmed as the square root of total element number based on equation (7)-(10).
G hs＝G sh(7)
K NK = 1 K - - - ( 8 )
K 2＝NK (9)
Those skilled in the art will fully understand, have discussed to describe multiple and various step of the present invention and process in this article and can refer to by computer, processor or use electrical phenomena to handle data and/or operation performed by other electronic computing device of converting.This computer and electronic equipment can adopt various volatibility and/or non-volatile memory, comprise the non-transitory computer-readable medium storing and there is executable program (comprising the various code or executable instruction that can be performed by computer or processor) thereon, wherein, memory and/or computer-readable medium can comprise memory and other computer-readable medium of form of ownership and type.
Only disclosure and description exemplary embodiment of the present invention is more than discussed.To discuss and by accompanying drawing, those skilled in the art can carry out various change, amendment and remodeling wherein by easily recognizing under the prerequisite not departing from by appended claims the spirit and scope of the present invention limited from these.

Claims (10)

1. a battery system, it comprises:
Power transmission line;
Multiple battery unit, it is electrically connected along described power transmission line, and each battery unit comprises battery unit monitoring assembly, and described battery unit monitoring assembly is monitored the parameter of described battery unit and communication interface is provided to described power transmission line;
Many communication lines, wherein, every bar communication line is all electrically connected with described power transmission line by many connecting lines, wherein, first connecting line is electrically attached to the first end of described power transmission line, and the second connecting line is electrically attached to the second end of described power transmission line, thus make all described battery units all between described first and second connecting lines, and wherein, at least another connecting line is electrically attached to described power transmission line between described first and second connecting lines, thus multiple battery unit is electrically connected along described power transmission line between described first connecting line and another connecting line described, and multiple battery unit is electrically connected along described power transmission line between described second connecting line and another connecting line described, and wherein, article two, the described battery unit between adjacent connecting line is defined by unit strings, and
Controller, it controls the signal be provided on described communication line.
2. battery system according to claim 1, wherein, the quantity of connecting line is at least four connecting lines, thus provides at least three unit strings.
3. battery system according to claim 2, wherein, described connecting line is being connected to the one of described communication line and is being connected between another communication line alternately.
4. battery system according to claim 1, wherein, described many communication lines are two communication lines.
5. battery system according to claim 1, wherein, the quantity of described unit strings depends on the quantity of the described battery unit in described battery system.
6. battery system according to claim 5, wherein, the quantity of described unit depends on and is passed to the transfer function gain of the transmission of signal of of described battery unit from described controller and is passed to the transfer function gain of the transmission of signal of described controller from one of described battery unit.
7. battery system according to claim 6, wherein, the quantity of described unit strings is determined when described transfer function gain is roughly the same.
8. battery system according to claim 6, wherein, the transfer function gain of the transfer function gain being passed to the transmission of signal of described controller from described unit and the transmission of signal being passed to described unit from described battery controller is the impedance based on described battery unit.
9. a vehicle battery system, it comprises:
Power transmission line;
Multiple battery pack intelligent cell, it is electrically connected along described power transmission line, and each battery unit comprises battery unit monitoring assembly, and described battery unit monitoring assembly is monitored the parameter of described battery unit and communication interface is provided to described power transmission line; And
First and second communication lines, first connecting line is electrically attached to the first end of described power transmission line and described first communication line, second connecting line is electrically attached to the second end of described power transmission line and described first communication line, 3rd connecting line is electrically attached to described second communication circuit and the described power transmission line between described first and second ends of described power transmission line, 4th connecting line is electrically attached to described first communication line and the described power transmission line between described first and second ends of described power transmission line, 5th connecting line is electrically attached to described second communication circuit and the described power transmission line between described first and second ends of described power transmission line, thus multiple described battery unit is along described first and the 3rd connecting line, described third and fourth connecting line, the described power transmission line of described 4th and the 5th connecting line and the described 5th and second between connecting line and electrically being connected.
10. a vehicle battery system, comprises
Power transmission line;
Multiple battery pack intelligent cell, it is electrically connected along described power transmission line, and each battery unit comprises battery unit monitoring assembly, and described battery unit monitoring assembly is monitored the parameter of described battery unit and communication interface is provided to described power transmission line;
First and second communication lines, it is electrically attached to described power transmission line by many connecting lines, wherein, first connecting line is electrically attached to the first end of described power transmission line, second connecting line is electrically attached to the second end of described power transmission line, thus all described battery units are between described first and second connecting lines, and wherein, other connecting line multiple is electrically attached to described power transmission line, and described first and second communication lines are in an alternating manner between described first and second connecting lines, thus multiple battery unit is electrically connected along the described power transmission line between adjacent connecting line, and wherein, described battery unit between two adjacent connecting lines is defined as unit strings, and
Controller, it controls the signal be provided on described communication line.
CN201510235752.0A 2014-04-03 2015-04-03 Powerline communication for monitoring of a high number of battery cells Pending CN104979866A (en)

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